/*
- * Unbuffered io for ffmpeg system
+ * unbuffered I/O
* Copyright (c) 2001 Fabrice Bellard
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
+#include <unistd.h>
+
+#include "libavutil/avstring.h"
+#include "libavutil/dict.h"
+#include "libavutil/opt.h"
+#include "os_support.h"
#include "avformat.h"
+#if CONFIG_NETWORK
+#include "network.h"
+#endif
+#include "url.h"
+
+static URLProtocol *first_protocol = NULL;
+
+URLProtocol *ffurl_protocol_next(URLProtocol *prev)
+{
+ return prev ? prev->next : first_protocol;
+}
+
+/** @name Logging context. */
+/*@{*/
+static const char *urlcontext_to_name(void *ptr)
+{
+ URLContext *h = (URLContext *)ptr;
+ if(h->prot) return h->prot->name;
+ else return "NULL";
+}
+
+static void *urlcontext_child_next(void *obj, void *prev)
+{
+ URLContext *h = obj;
+ if (!prev && h->priv_data && h->prot->priv_data_class)
+ return h->priv_data;
+ return NULL;
+}
+
+static const AVClass *urlcontext_child_class_next(const AVClass *prev)
+{
+ URLProtocol *p = NULL;
+
+ /* find the protocol that corresponds to prev */
+ while (prev && (p = ffurl_protocol_next(p)))
+ if (p->priv_data_class == prev)
+ break;
-static int default_interrupt_cb(void);
+ /* find next protocol with priv options */
+ while (p = ffurl_protocol_next(p))
+ if (p->priv_data_class)
+ return p->priv_data_class;
+ return NULL;
-URLProtocol *first_protocol = NULL;
-URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
+}
+
+static const AVOption options[] = {{NULL}};
+const AVClass ffurl_context_class = {
+ .class_name = "URLContext",
+ .item_name = urlcontext_to_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+ .child_next = urlcontext_child_next,
+ .child_class_next = urlcontext_child_class_next,
+};
+/*@}*/
+
+
+const char *avio_enum_protocols(void **opaque, int output)
+{
+ URLProtocol **p = opaque;
+ *p = ffurl_protocol_next(*p);
+ if (!*p) return NULL;
+ if ((output && (*p)->url_write) || (!output && (*p)->url_read))
+ return (*p)->name;
+ return avio_enum_protocols(opaque, output);
+}
-int register_protocol(URLProtocol *protocol)
+int ffurl_register_protocol(URLProtocol *protocol, int size)
{
URLProtocol **p;
+ if (size < sizeof(URLProtocol)) {
+ URLProtocol* temp = av_mallocz(sizeof(URLProtocol));
+ memcpy(temp, protocol, size);
+ protocol = temp;
+ }
p = &first_protocol;
while (*p != NULL) p = &(*p)->next;
*p = protocol;
return 0;
}
-int url_open(URLContext **puc, const char *filename, int flags)
+static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
+ const char *filename, int flags,
+ const AVIOInterruptCB *int_cb)
{
URLContext *uc;
- URLProtocol *up;
- const char *p;
- char proto_str[128], *q;
int err;
- p = filename;
- q = proto_str;
- while (*p != '\0' && *p != ':') {
- /* protocols can only contain alphabetic chars */
- if (!isalpha(*p))
- goto file_proto;
- if ((q - proto_str) < sizeof(proto_str) - 1)
- *q++ = *p;
- p++;
- }
- /* if the protocol has length 1, we consider it is a dos drive */
- if (*p == '\0' || (q - proto_str) <= 1) {
- file_proto:
- strcpy(proto_str, "file");
- } else {
- *q = '\0';
- }
-
- up = first_protocol;
- while (up != NULL) {
- if (!strcmp(proto_str, up->name))
- goto found;
- up = up->next;
- }
- err = -ENOENT;
- goto fail;
- found:
- uc = av_malloc(sizeof(URLContext) + strlen(filename));
+#if CONFIG_NETWORK
+ if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
+ return AVERROR(EIO);
+#endif
+ uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
if (!uc) {
- err = -ENOMEM;
+ err = AVERROR(ENOMEM);
goto fail;
}
+ uc->av_class = &ffurl_context_class;
+ uc->filename = (char *) &uc[1];
strcpy(uc->filename, filename);
uc->prot = up;
uc->flags = flags;
uc->is_streamed = 0; /* default = not streamed */
uc->max_packet_size = 0; /* default: stream file */
- err = up->url_open(uc, filename, flags);
- if (err < 0) {
- av_free(uc);
- *puc = NULL;
- return err;
+ if (up->priv_data_size) {
+ uc->priv_data = av_mallocz(up->priv_data_size);
+ if (up->priv_data_class) {
+ *(const AVClass**)uc->priv_data = up->priv_data_class;
+ av_opt_set_defaults(uc->priv_data);
+ }
}
+ if (int_cb)
+ uc->interrupt_callback = *int_cb;
+
*puc = uc;
return 0;
fail:
*puc = NULL;
+#if CONFIG_NETWORK
+ if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
+ ff_network_close();
+#endif
return err;
}
-int url_read(URLContext *h, unsigned char *buf, int size)
+int ffurl_connect(URLContext* uc, AVDictionary **options)
{
- int ret;
- if (h->flags & URL_WRONLY)
- return AVERROR_IO;
- ret = h->prot->url_read(h, buf, size);
+ int err =
+ uc->prot->url_open2 ? uc->prot->url_open2(uc, uc->filename, uc->flags, options) :
+ uc->prot->url_open(uc, uc->filename, uc->flags);
+ if (err)
+ return err;
+ uc->is_connected = 1;
+ //We must be careful here as ffurl_seek() could be slow, for example for http
+ if( (uc->flags & AVIO_FLAG_WRITE)
+ || !strcmp(uc->prot->name, "file"))
+ if(!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
+ uc->is_streamed= 1;
+ return 0;
+}
+
+#define URL_SCHEME_CHARS \
+ "abcdefghijklmnopqrstuvwxyz" \
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+ "0123456789+-."
+
+int ffurl_alloc(URLContext **puc, const char *filename, int flags,
+ const AVIOInterruptCB *int_cb)
+{
+ URLProtocol *up = NULL;
+ char proto_str[128], proto_nested[128], *ptr;
+ size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
+
+ if (filename[proto_len] != ':' || is_dos_path(filename))
+ strcpy(proto_str, "file");
+ else
+ av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str)));
+
+ av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
+ if ((ptr = strchr(proto_nested, '+')))
+ *ptr = '\0';
+
+ while (up = ffurl_protocol_next(up)) {
+ if (!strcmp(proto_str, up->name))
+ return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
+ if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
+ !strcmp(proto_nested, up->name))
+ return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
+ }
+ *puc = NULL;
+ return AVERROR(ENOENT);
+}
+
+int ffurl_open(URLContext **puc, const char *filename, int flags,
+ const AVIOInterruptCB *int_cb, AVDictionary **options)
+{
+ int ret = ffurl_alloc(puc, filename, flags, int_cb);
+ if (ret)
+ return ret;
+ if (options && (*puc)->prot->priv_data_class &&
+ (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
+ goto fail;
+ ret = ffurl_connect(*puc, options);
+ if (!ret)
+ return 0;
+fail:
+ ffurl_close(*puc);
+ *puc = NULL;
return ret;
}
-#ifdef CONFIG_MUXERS
-int url_write(URLContext *h, unsigned char *buf, int size)
+static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min,
+ int (*transfer_func)(URLContext *h, unsigned char *buf, int size))
{
- int ret;
- if (!(h->flags & (URL_WRONLY | URL_RDWR)))
- return AVERROR_IO;
+ int ret, len;
+ int fast_retries = 5;
+
+ len = 0;
+ while (len < size_min) {
+ ret = transfer_func(h, buf+len, size-len);
+ if (ret == AVERROR(EINTR))
+ continue;
+ if (h->flags & AVIO_FLAG_NONBLOCK)
+ return ret;
+ if (ret == AVERROR(EAGAIN)) {
+ ret = 0;
+ if (fast_retries)
+ fast_retries--;
+ else
+ usleep(1000);
+ } else if (ret < 1)
+ return ret < 0 ? ret : len;
+ if (ret)
+ fast_retries = FFMAX(fast_retries, 2);
+ len += ret;
+ if (ff_check_interrupt(&h->interrupt_callback))
+ return AVERROR_EXIT;
+ }
+ return len;
+}
+
+int ffurl_read(URLContext *h, unsigned char *buf, int size)
+{
+ if (!(h->flags & AVIO_FLAG_READ))
+ return AVERROR(EIO);
+ return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
+}
+
+int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
+{
+ if (!(h->flags & AVIO_FLAG_READ))
+ return AVERROR(EIO);
+ return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
+}
+
+int ffurl_write(URLContext *h, const unsigned char *buf, int size)
+{
+ if (!(h->flags & AVIO_FLAG_WRITE))
+ return AVERROR(EIO);
/* avoid sending too big packets */
if (h->max_packet_size && size > h->max_packet_size)
- return AVERROR_IO;
- ret = h->prot->url_write(h, buf, size);
- return ret;
+ return AVERROR(EIO);
+
+ return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
}
-#endif //CONFIG_MUXERS
-offset_t url_seek(URLContext *h, offset_t pos, int whence)
+int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
{
- offset_t ret;
+ int64_t ret;
if (!h->prot->url_seek)
- return -EPIPE;
- ret = h->prot->url_seek(h, pos, whence);
+ return AVERROR(ENOSYS);
+ ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
return ret;
}
-int url_close(URLContext *h)
+int ffurl_close(URLContext *h)
{
- int ret;
+ int ret = 0;
+ if (!h) return 0; /* can happen when ffurl_open fails */
- ret = h->prot->url_close(h);
+ if (h->is_connected && h->prot->url_close)
+ ret = h->prot->url_close(h);
+#if CONFIG_NETWORK
+ if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
+ ff_network_close();
+#endif
+ if (h->prot->priv_data_size) {
+ if (h->prot->priv_data_class)
+ av_opt_free(h->priv_data);
+ av_free(h->priv_data);
+ }
av_free(h);
return ret;
}
-int url_exist(const char *filename)
+int avio_check(const char *url, int flags)
{
URLContext *h;
- if (url_open(&h, filename, URL_RDONLY) < 0)
- return 0;
- url_close(h);
- return 1;
-}
+ int ret = ffurl_alloc(&h, url, flags, NULL);
+ if (ret)
+ return ret;
-offset_t url_filesize(URLContext *h)
-{
- offset_t pos, size;
+ if (h->prot->url_check) {
+ ret = h->prot->url_check(h, flags);
+ } else {
+ ret = ffurl_connect(h, NULL);
+ if (ret >= 0)
+ ret = flags;
+ }
- pos = url_seek(h, 0, SEEK_CUR);
- size = url_seek(h, -1, SEEK_END)+1;
- url_seek(h, pos, SEEK_SET);
- return size;
+ ffurl_close(h);
+ return ret;
}
-/*
- * Return the maximum packet size associated to packetized file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- *
- * @param h file handle
- * @return maximum packet size in bytes
- */
-int url_get_max_packet_size(URLContext *h)
+int64_t ffurl_size(URLContext *h)
{
- return h->max_packet_size;
-}
+ int64_t pos, size;
-void url_get_filename(URLContext *h, char *buf, int buf_size)
-{
- pstrcpy(buf, buf_size, h->filename);
+ size= ffurl_seek(h, 0, AVSEEK_SIZE);
+ if(size<0){
+ pos = ffurl_seek(h, 0, SEEK_CUR);
+ if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
+ return size;
+ size++;
+ ffurl_seek(h, pos, SEEK_SET);
+ }
+ return size;
}
-
-static int default_interrupt_cb(void)
+int ffurl_get_file_handle(URLContext *h)
{
- return 0;
+ if (!h->prot->url_get_file_handle)
+ return -1;
+ return h->prot->url_get_file_handle(h);
}
-/**
- * The callback is called in blocking functions to test regulary if
- * asynchronous interruption is needed. -EINTR is returned in this
- * case by the interrupted function. 'NULL' means no interrupt
- * callback is given.
- */
-void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
+int ff_check_interrupt(AVIOInterruptCB *cb)
{
- if (!interrupt_cb)
- interrupt_cb = default_interrupt_cb;
- url_interrupt_cb = interrupt_cb;
+ int ret;
+ if (cb && cb->callback && (ret = cb->callback(cb->opaque)))
+ return ret;
+ return 0;
}
projects / ffmpeg / blobdiff